package com.lixia.lxframework.framework.utils.ip;


import javax.servlet.http.HttpServletRequest;

/**
 * Ip 工具类
 *Captcha
 * @author Administrator
 * @date 2020/6/9
 */
public class IPUtils {

    private static IPUtils instance = new IPUtils();

    private IPUtils() {
    }

    public static IPUtils getInstance() {
        return instance;
    }

    /***
     * @Author Mr.wang
     * @Description // 获取用户真实IP地址，不使用request.getRemoteAddr()的原因是有可能用户使用了代理软件方式避免真实IP地址,
     * 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值
     * @Date 2019/3/3 3:37
     * @Param
     * @return
     */
    public static String getIpAddress(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        //多次反向代理后会有多个ip值，第一个ip才是真实ip
        if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {
            if (ip.contains(",")) {
                ip = ip.split(",")[0];
            }
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Real-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }

}
